Add offscreen-canvas support for the jupyterlite-xeus case (#365)

* wip

* widget shows up

* mouse events work

* something is working

* a lot works

* sizing

* gradients and patterns

* images

* images

* fixed typos

* batch rects

* batch rects

* polygons

* line segments

* fixed minor non-lite issues

* docs

* fixes

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* added kitchen sink styled example

* wip

* widget shows up

* mouse events work

* something is working

* a lot works

* sizing

* gradients and patterns

* images

* images

* fixed typos

* batch rects

* batch rects

* polygons

* line segments

* fixed minor non-lite issues

* docs

* fixes

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* added kitchen sink styled example

* added example

* added missing images

* added images to lite

* added images to lite

* Update docs/conf.py

Co-authored-by: martinRenou <[email protected]>

* Update ipycanvas/compat.py

Co-authored-by: martinRenou <[email protected]>

* include/exclude

* debug

* debug

* debug2

* debug2

---------

Co-authored-by: martinRenou <[email protected]>

Author: DerThorsten

docs/conf.py

@@ -4,6 +4,11 @@
 jupyterlite_dir = "."
 jupyterlite_silence = False
 
+jupyterlite_contents = [
+   "*.ipynb",
+    "sprites/*.png",
+]
+
 master_doc = "index"
 source_suffix = ".rst"
 
@@ -29,4 +34,4 @@
 
 html_css_files = ["custom.css"]
 
-autodoc_member_order = "bysource"
+autodoc_member_order = "bysource"